Tip

Field Validation on the Web

This generic function gets passed the fields that need to be checked for values and the text that becomes part of the alert message if a field is found to be blank. If all fields check out, the form submits. When a field fails to pass the test, the focus is passed to the field after the alert message is provided.


<INPUT TYPE = "button" NAME = "Submit" VALUE = "Submit Form" onClick = "submitForm(this.form)">

//Generic Blank field checker
function isValue(errText,fieldObj) {
if (fieldObj.value =="") {
alert("Please enter " + errText + " data, it is required to complete this form. Press OK to return to the field.");
fieldObj.focus();
return false;
}
else
{
return true;
}
}

function submitForm (form) {
if(

//The lines below send each field through the isValue function to see if they have values.

(isValue("Contact's Title",document.forms[0].CME_CONTACT_TITLE) ) && (isValue("Contact First
Name",document.forms[0].CME_CONTACT_FIRST_NAME) ) &&
(isValue("Contact Last Name",document.forms[0].CME_CONTACT_LAST_NAME) ) &&
(isValue("Contact Position",document.forms[0].CME_CONTACT_POSITION) ) &&
(isValue("CME Name",document.forms[0].CME_NAME) ) &&
(isValue("CME Address Line 1",document.forms[0].CME_ADDRESS_ONE) ) &&
(isValue("CME Address Line 2",document.forms[0].CME_ADDRESS_TWO) ) &&

This was first published in March 2001

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